Compound shade-reflector of glass.



O. A. MYGATT. COMPOUND SHADE REFLECTOR OF GLASS.

APPLICATION FILED JULY 14,1905.

Patented Marlfi, 1912.

[NVENTOR M Allorlmy sin OTIS A; MYGATT, on NEW YORK, 15. 2..

COMPOUND SHADE- REFLECTOR OF GLASS.

Specification of Letters Patent.

Patented Mar. 5, 1912.

Application filed July 14,1905. Serial No. 269,715.

To all whom it may concern:

Be it known that I, OTIS A. Mrca'rr, citizen of the United, States, residing at New York, in the county of New York and State of New York, have invented certain new anduseful Improvements in Compound Shade-Reflectors of Glass, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates .to shade-reflectors (for artificial lights) composed of glass, known as transparent glass, although sometimes slightly tinted.

The object of the invention is to produce a reflector and shade combined, in which a definite amount of light can be permitted to pass through the shade-reflector, and a definite amount can be reflected back, and, if desirable, the quality or direction, or both, of light rays may be changed by passing through the shade, as well as the quality of the reflected rays which do not pass through the glass of the reflector, but are reflected thereby; The transmission is obtained by transmitting, or transmitting and directing, surfaces placed between the longitudinal sides of the reflecting prisms.

Figure 1 is a side elevation of a shadereflector involving the principles of my present invention. Fig. 2 is a top plan of the same... Fig. 3 is a side elevation of a modification. In Fig. 1, A'indicates a reflector of common form. B, B indicate external reflecting prisms. As shown, these prisms extend vertically or radially with reference to the body of the reflector. Between reflecting prisms B there are plane surfaces C, which permit the light rays to pass through the glass reflector. From such a construction it will be apparent that nearly all the light rays from a lamp within reflector A which encounter the prisms B will be reflected back and out the open mouth of the reflector, while the rays which encounter plane surfaces C will pass through and out without diversion. (Surfaces C may be. slightly convex or concave.)

Frequently the rays which pass through at C are too brilliant for comfortable illum ination. Therefore these plane (or slightly convex or concave) faces may be etched or frosted, as at C, this etching or frosting having the effect of softening and diffusing the light rays transmitted, but not of direct ing the rays in any particular direction.

Should. it be desirable to direct a large proportion of the transmitted light rays in. a deteri'nlned direction. instead of employing the frosted surfaces G, I may employ lightrefracting 'or directing ribs or prisms C .reflector between the reflecting prisms may be directed either upward or downward by proper and known construction of the prisms C or may be dlfl'used or softened by thefrosted surface C, or may be merely transmitted through the plane surface C, and this direction, transmission, or diflusion may vary with different parts of the surface of the same shade reflector.

A definite quantity of light may be transmitted and a definite quantity reflected, a definite proportion may be distributed in directions other than the natural direction of the light rays, and a highly decorative article may at the same time be produced.

For cheapness of construction and perfection of finish my shade-reficctors are preferably of one piece of pressed transparent.

glass. Frosted surfaces are afterward etched or ground on. But all processes usual in this art may be employed in the production of shade-reflectors according to my invention.

The shade-reflectors are not necessarily frusto-conical, but are of all the forms usual in this art. By reflecting prisms, I mean prisms whose sides make angles of substantially 45 with incident light rays and have an apex angle of substantially 90.

What I claim is:

1. A glass shade-reflector having an open mouth, provided with reflecting risms disposed longitudinally and adapte light rays back and out of the open mouth of the reflector, and ribs interposed between the longitudinal sides of said prisms.

2. A shade-reflector having an open mouth, provided with radial reflecting prisms for reflecting light rays back into and out of the open mouth of the reflector, and light transmitting ribs interposed between the longitudinal sides of the prisms.

3. A glass shade-reflector having an open to reflect a zriouuii provided with radial reflecting 'mouth, provided with radial reflecting prisms for reflecting light rays back into 0st or the open m-euth of the reflector,

and circumferential ribs interposed between the iongrtudmalsnles and substantially at right angles to said prisms.

5. A glass shade-reflector having an open the prisms.

light rays back into:

In teshmony whereof I afix my signature 20 in presence of two witnesses.

OTIS A. MYGAT'R.

Witnesses H. E. NixsoN, GEL'L-A. Core. 

